[70.06] A New Proposal On Explosion Mechanism Of Core Collapsed Supernova

Q. Peng (Department of Astronomy, Nanjing University)

The explosion mechanism of the SNII is a puzzle and still
remains an open question up to date. In this paper, we
propose a new explosion mechanism of SNII based on a new
criterion for the SN collapse condition. The detail of the
work is discussed in following steps: a) We choose the
condition that the timescale of the electron capture being
shorter than that of the hydrodynamic collapsing as a new
criterion to initiate the fast collapse of a SN core, as a
replacement of the well recognized Chandrasekhar mass limit
criterion. With this new criterion, we demonstrate that the
rapid collapsing core of the SNII is only a part of an iron
core, instead of being the whole iron core of the
presupernova. b) We illustrate that a rapid collapsing core
under such condition can supply a prompt explosion mechanism
for the SNII. Both an outgoing rebounded shock wave and a
neutrino flux produced in the nascence neutron star can
travel through the rapid collapsing core during the
collapsing process. c) We further demonstrate the presence
of a high temperature vacuum zone between the rapid
collapsing inner core and the outer slowly contracting iron
core of the presupernova in this two-core model. The density
in the vacuum zone is much lower than that in both inner and
out cores. In this region, both the radiation field and the
neutrino flux go through an expansion approximately as
T4\times R3 ~const. . The temperatures of both
the radiation field in the outgoing shock wave and the
neutrino flux continue to decrease until the energy of the
gamma ray photons in the outgoing shock wave and that of the
neutrino in the neutrino flux drop below the bonding energy
of a nucleon for iron group nucleus. The nuclei in the rest
slowly contracting iron core of the presupernova will not be
disintegrated by both the gamma ray photons in the outgoing
shock wave and the neutrino in the neutrino flux. d) We
finally show that, under this mechanism, the rest slowly
contracting outer iron core, the mantle and the atmosphere
of the presupernova are eventually blown out by the
radiation pressure of the outgoing shock wave and the
neutrino flux through the interaction between the neutrinos
and the iron group nuclei. This is just the supernova
explosion.

The author(s) of this abstract have provided an email address
for comments about the abstract:
qhpeng@nju.edu.cn